An approach for proximity detection machining of machined parts

Abstract

This invention discloses a method for proximity detection machining of machined parts, comprising the following steps: S1. Machining two end faces, a large end and a small end, of the machined part to be inspected; S2. First, using the small end face as the mounting end face and the large end face as the measurement reference surface, taking circles 5mm and 10mm downwards along its inner circular surface and measuring their diameters. Finally, based on the diameter measurements, calculating the calculated diameter of the inner circular surface at the measurement reference surface and calculating the theoretical diameter height; S3. Creating an inspection table; S4. Filling in the actual measured diameter values ​​in the inspection table; S5. Machining the large end face again according to the theoretical diameter height P value; S6. Repeating steps S2 to S4; S7. Machining the large end face again according to the theoretical diameter height P value until the P value approaches zero, thus completing the inspection machining of the machined part. The proximity detection machining method of this invention provides a new solution for machining irregularly shaped thermally expanding parts.

Description

Technical Field

[0001] This invention relates to the field of CNC machined parts inspection technology, specifically a method for approximate inspection of machined parts. Background Technology

[0002] like Figure 1 The machined part shown is an irregularly shaped, thermally expanding part, comprising a bell-shaped part with one straight end and a spline curve at the other. This part is made from 4mm thick sheet metal, manufactured through processes including sheet rolling, welding, thermal expansion, and manual shaping. The thermal expansion process involves using a hot-pressing technique to expand the straight part through a mold, transforming it into a bell-shaped part with one straight end and a spline curve at the other. Due to varying degrees of expansion, the overall wall thickness of the part is not uniform; the larger the diameter, the thinner the wall. Because this is a thermally expanding part, although it undergoes a manual shaping process, the significant variations in manual shaping result in the part still not guaranteeing uniformity of its inner diameter after shaping.

[0003] In the specific processing, after the machining process is completed, the two ends of the part need to be combined and welded. After the part is combined and welded, its inner surface is no longer processed. In order to ensure that the inner surface flow channel of the final part is smooth after welding, the tolerance requirements for the inner diameter of the two ends of the part are very high. For example Figure 2 and Figure 3 As shown, the inner diameter of one end of the part's cross-section is a straight line, which can be ensured by a thermal expansion mold to maintain its uniformity without requiring machining. The other end, however, is a spline curve. When measuring the inner diameter of the part's end face using existing conventional methods, the main problems are: First, direct measurement with calipers cannot inspect the curved inner wall; coordinate measuring machines cannot be used because the measurement datum cannot be fixed. Second, the indirect measurement method of subtracting the wall thickness from the outer diameter is also excluded due to the influence of chamfered burrs on the outer diameter and the uncertainty of the wall thickness. Third, using existing contour jigs, after fitting the part in the jig, first measuring the height difference and then deducing the diameter, is also problematic because the part shrinks after thermal expansion in the previous process. Since the surface curvature of each part differs after shrinkage, this leads to large measurement errors, thus abandoning the use of existing contour jigs. Therefore, it is clear that existing conventional methods cannot meet the requirements for direct measurement of the inner diameter of the part's end face, increasing the difficulty of inspection and measurement. Therefore, in order to meet the processing and use requirements of such parts and reduce the difficulty of inspection and measurement, a different inspection and processing method from the existing technology is provided to solve the above problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the problems existing in the background art, thereby providing a proximity detection and processing method. By utilizing the principle of the same taper and the same inclination of a cone, and through two proximity measurements, it can not only reduce the difficulty of inspection and measurement, but also improve the processing efficiency and processing accuracy of irregular thermal expansion parts, thereby meeting the usage requirements of irregular thermal expansion parts. Specifically, it is a proximity detection and processing method for machined parts.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a proximity detection machining method for machined parts, the proximity detection machining method comprising the following steps:

[0006] S1. For the machined parts to be inspected, use a CNC lathe to machine the two end faces of the large and small ends of the parts in one go;

[0007] S2. First, place the machined part on the inspection table, select the small end face as the mounting end face, and the large end face as the measurement reference surface of the coordinate measuring machine. Then, using the measurement reference surface as the measurement position, take circles 5mm and 10mm down from its inner circle surface, and mark them as points A and B respectively. Measure the diameter of point A as dA and the diameter of point B as dB. Finally, based on the three-point generatrix determination method, and using the principle of the same taper and slope of a cone, use the measured diameter values ​​of points A and B to calculate the calculated diameter of point C on the inner circle surface of the measurement reference surface, denoted as dC. Based on the calculated diameter value dC of point C, determine its theoretical diameter position and calculate the theoretical diameter height value P of point C.

[0008] S3. The inspector creates an inspection table based on the values ​​in step S2. The inspection table includes the serial number, the theoretical diameter height P from point C to its theoretical diameter position, the theoretical diameter value of point C, and the actual measured diameter value of point C.

[0009] S4. The inspector fills in the actual measured value of the diameter of point C in the corresponding position on the inspection form;

[0010] S5. The lathe operator, based on the values ​​obtained from the inspection form and the theoretical diameter and height P value, leaves a machining allowance of 5mm and then machines the large end face again.

[0011] S6. The inspector repeats steps S2 to S4;

[0012] S7. The lathe operator, based on the values ​​obtained from the inspection form and the theoretical diameter and height P value, re-machines the large end face until the P value approaches zero, thus completing the inspection and machining of the machined part.

[0013] Furthermore, in the approach detection processing method for machined parts described in this invention, in step S2, when taking circles 5mm and 10mm down from the inner circular surface of the machined part to be inspected, it is required that at least three sets of diameter values ​​be measured along the circumference of points A and B on the same height section of its inner wall. By measuring points on multiple equal height sections, errors can be reduced, and the diameter calculation value dC of point C on the inner circular surface at the measurement reference plane is calculated by back-calculating each set of diameter measurement values.

[0014] Furthermore, in the approach detection machining method for machined parts described in this invention, in step S5, the lathe operator, according to the values ​​obtained from the inspection table, if the theoretical diameter height P value is greater than 10mm, leaves a machining allowance of 5mm, and performs multiple milling operations using a CNC lathe with a milling thickness of 1mm. If the theoretical diameter height P value is between 5 and 10mm, leaving a machining allowance of 5mm, the lathe operator first uses a CNC lathe to mill the outer cylindrical surface of the large end face of the machined part with a milling thickness of 1mm. Through multiple milling operations, the milling is performed until the theoretical diameter height P value is between 5 and 6mm. Then, the CNC lathe is used to mill the outer cylindrical surface of the large end face of the machined part with a milling thickness of 0.1mm until the machining allowance is reached.

[0015] Furthermore, in the approach detection machining method for machined parts described in this invention, in step S7, the lathe operator uses a CNC lathe to mill the outer cylindrical surface of the large end face of the machined part according to the value obtained from the inspection table, such as the theoretical diameter height P value being between 0 and 5 mm, in a milling thickness of 1 mm. The milling is carried out until the P value approaches zero, thus completing the inspection machining of the machined part.

[0016] Compared with the prior art, the following advantages of the approach detection machining method for machined parts described in this invention are: using the small end face as the mounting end face and the large end face as the measurement reference surface facilitates operation; at the same time, using the measurement reference surface as the measurement position, circles are taken down 5mm and 10mm. When taking the circles, multiple measurement points are taken at the same height section of the inner wall, which can reduce errors; finally, using the principle of the same taper and the same slope of the cone, through two approach measurements, the remaining machining allowance can be intuitively known by the machining personnel using the values ​​in the inspection table.

[0017] Therefore, the approach detection and processing method described in this invention can not only reduce the difficulty of inspection and measurement, but also improve the processing efficiency and accuracy of irregular thermal expansion parts, thereby meeting the usage requirements of irregular thermal expansion parts. It solves the problem that the inner diameter of the end face of the part cannot be directly measured, and provides a new solution for the processing of irregular thermal expansion parts. It greatly improves the processing efficiency and accuracy of irregular thermal expansion parts, thereby meeting the usage requirements of irregular thermal expansion parts, and is particularly suitable for the processing needs of irregular thermal expansion parts. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings.

[0019] Figure 1 It is a three-dimensional structural diagram of the part to be machined;

[0020] Figure 2 yes Figure 1 Top view;

[0021] Figure 3 yes Figure 2 Schematic diagram of the BB-direction cross-section structure;

[0022] Figure 4 This is a schematic diagram of the detection and processing principle of the present invention. Detailed Implementation

[0023] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0024] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness or purpose of the invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms "upper," "lower," "left," and "right" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "provided with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] It should be noted that the term "comprising" or any other variation is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Example 1

[0027] like Figure 4 As shown in this embodiment, a proximity detection machining method for machined parts includes the following steps:

[0028] S1. For the machined parts to be inspected, use a CNC lathe to machine the two end faces of the large and small ends of the parts in one go;

[0029] S2. First, place the machined part on the inspection table, select the small end face as the mounting end face, and the large end face as the measurement reference surface of the coordinate measuring machine. Then, using the measurement reference surface as the measurement position, take circles 5mm and 10mm down from its inner circle surface, and mark them as points A and B respectively. Measure the diameter of point A as dA and the diameter of point B as dB. Finally, based on the three-point generatrix determination method, and using the principle of the same taper and slope of a cone, use the measured diameter values ​​of points A and B to calculate the calculated diameter of point C on the inner circle surface of the measurement reference surface, denoted as dC. Based on the calculated diameter value dC of point C, determine its theoretical diameter position and calculate the theoretical diameter height value P of point C.

[0030] S3. The inspector creates an inspection table based on the values ​​in step S2. The inspection table includes the serial number, the theoretical diameter height P from point C to its theoretical diameter position, the theoretical diameter value of point C, and the actual measured diameter value of point C.

[0031] S4. The inspector fills in the actual measured value of the diameter of point C in the corresponding position on the inspection form;

[0032] S5. The lathe operator, based on the values ​​obtained from the inspection form and the theoretical diameter height P value, leaves a 5mm machining allowance and re-machines the large end face. In the specific inspection and machining process, the lathe operator, based on the values ​​obtained from the inspection form, if the theoretical diameter height P value is greater than 10mm, leaves a 5mm machining allowance and uses a CNC lathe to perform multiple milling operations with a milling thickness of 1mm. If the theoretical diameter height P value is between 5 and 10mm, leaving a 5mm machining allowance, the operator first uses a CNC lathe to mill the outer cylindrical surface of the large end face of the machined part with a milling thickness of 1mm. Through multiple milling operations, the machined part is milled until the theoretical diameter height P value is between 5 and 6mm. Then, the machined part is milled again with a CNC lathe with a milling thickness of 0.1mm until the machining allowance is reached.

[0033] S6. The inspector repeats steps S2 to S4;

[0034] S7. Lathe operators shall use the values ​​obtained from the inspection form, such as the theoretical diameter and height P value being between 0 and 5 mm, to mill the outer cylindrical surface of the large end face of the machined part using a CNC lathe with a milling thickness of 1 mm. The milling shall continue until the P value approaches zero, thus completing the inspection and processing of the machined part. Example 2

[0035] This embodiment is based on embodiment 1. Because thermal expansion and manual correction cause the machined part to be not a standard circle, in order to improve the accuracy of the near-inspection process, when taking circles 5mm and 10mm down from the inner circle surface of the machined part to be inspected, it is required that at least three sets of diameter values ​​be measured along the circumference of points A and B on the same height section of the inner wall. By measuring points on multiple height sections and calculating the diameter value of point C on the inner circle surface at the measurement reference plane for each set of diameter measurements, the error can be reduced.

[0036] Since the taper of a cone can be obtained by the ratio of its base diameter to its height, and the slope can be obtained by dividing the height difference between any two points on a straight line by the difference in horizontal distance between those two points, the approach detection machining method described in this invention utilizes the small end face as the mounting end face and the large end face as the measurement reference surface, which facilitates operation. Simultaneously, using the measurement reference surface as the measurement position, circles are taken downwards at 5mm and 10mm. When taking these circles, multiple measurements are taken at the same height section of the inner wall to reduce errors. Finally, utilizing the principle of the same taper and slope of the cone, the diameter of point C on the inner surface of the measurement reference surface is calculated by measuring the diameter values ​​of points A and B. Based on the calculated diameter value of point C, the theoretical diameter position is determined, and the theoretical diameter height is calculated. By employing two approach measurements and using the values ​​in the inspection table, the machining personnel can intuitively know the remaining machining allowance, facilitating milling of the large end face.

[0037] Therefore, the approach detection and processing method described in this invention can not only reduce the difficulty of inspection and measurement, but also improve the processing efficiency and accuracy of irregular thermal expansion parts, thereby meeting the usage requirements of irregular thermal expansion parts. It solves the problem that the inner diameter of the end face of the part cannot be directly measured, and provides a new solution for the processing of irregular thermal expansion parts. It greatly improves the processing efficiency and accuracy of irregular thermal expansion parts, thereby meeting the usage requirements of irregular thermal expansion parts, and is particularly suitable for the processing needs of irregular thermal expansion parts.

[0038] Other aspects of this invention that are not detailed herein are all conventional techniques known to those skilled in the art.

[0039] The scope of protection of this invention is not limited to the technical solutions disclosed in the specific embodiments. The above description is only a preferred embodiment of this invention and does not limit this invention. Any minor modifications, equivalent substitutions and improvements made based on the technical solutions of this invention should be included within the scope of protection of the technical solutions of this invention.

Claims

1. A method for proximity detection machining of machined parts, characterized in that, The proximity detection processing method includes the following steps: S1. For the machined parts to be inspected, use a CNC lathe to machine the two end faces of the large and small ends of the parts in one go; S2. First, place the machined part on the inspection table, select the small end face as the mounting end face, and the large end face as the measurement reference surface of the coordinate measuring machine. Then, using the measurement reference surface as the measurement position, take circles 5mm and 10mm down from its inner circle surface, and mark them as points A and B respectively. Measure the diameter of point A as dA and the diameter of point B as dB. Finally, based on the three-point generatrix determination method, and using the principle of the same taper and slope of a cone, use the measured diameter values ​​of points A and B to calculate the calculated diameter of point C on the inner circle surface of the measurement reference surface, denoted as dC. Based on the calculated diameter value dC of point C, determine its theoretical diameter position and calculate the theoretical diameter height value P of point C. S3. The inspector creates an inspection table based on the values ​​in step S2. The inspection table includes the serial number, the theoretical diameter height P from point C to its theoretical diameter position, the theoretical diameter value of point C, and the actual measured diameter value of point C. S4. The inspector fills in the actual measured value of the diameter of point C in the corresponding position on the inspection form; S5. The lathe operator, based on the values ​​obtained from the inspection form and the theoretical diameter and height P value, leaves a machining allowance of 5mm and then machines the large end face again. S6. The inspector repeats steps S2 to S4; S7. The lathe operator, based on the values ​​obtained from the inspection form and the theoretical diameter and height P value, re-machines the large end face until the P value approaches zero, thus completing the inspection and machining of the machined part.

2. The approach detection machining method for machined parts according to claim 1, characterized in that: In step S2, when taking circles 5mm and 10mm down from the inner circular surface of the machined part to be inspected, it is required that at least three sets of diameter values ​​be measured along the circumference of points A and B on the same height section of the inner wall. By measuring points on multiple equal height sections, errors can be reduced, and the diameter calculation value dC of point C on the inner circular surface at the measurement reference plane can be calculated by back-calculating each set of diameter measurement values.

3. The approach detection machining method for machined parts according to claim 1, characterized in that: In step S5, the lathe operator, according to the values ​​obtained from the inspection table, if the theoretical diameter height P value is greater than 10mm, leaves a machining allowance of 5mm and uses a CNC lathe to perform multiple milling operations with a milling thickness of 1mm. If the theoretical diameter height P value is between 5 and 10mm, leaves a machining allowance of 5mm, first uses a CNC lathe to mill the outer cylindrical surface of the large end face of the machined part with a milling thickness of 1mm. Through multiple milling operations, the milling is performed until the theoretical diameter height P value is between 5 and 6mm. Then, the CNC lathe is used to mill the outer cylindrical surface of the large end face of the machined part with a milling thickness of 0.1mm until the machining allowance is reached.

4. The approach detection machining method for machined parts according to claim 1, characterized in that: In step S7, the lathe operator uses a CNC lathe to mill the outer cylindrical surface of the large end face of the machined part according to the value obtained from the inspection table, such as the theoretical diameter height P value being between 0 and 5 mm. The milling is carried out until the P value approaches zero, thus completing the inspection and processing of the machined part.

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